4-Hydroxybenzoic acid - Wikipedia

In addition to SA accumulation, a second phenypropanoid compound, 4-hydroxybenzoic acid (4HBA) was accumulated in phloem fluids of inoculated cucumber leaves with the same kinetics as SA.


Preparation of 4-hydroxybenzoic acid

4-Hydroxybenzoic acid - American Chemical Society

Materials: p-Aminophenol, p-aminobenzoic acid 3-nitrophenol, 2-hydroxybenzoic acid, 2-chloroaniline, 3-methoxy-1-aminobenzene and resorcinol were purchased from BDH Chemical Company and Aldrich Chemical Company and used without further purification. All other chemicals used in the synthesis and characterization were of laboratory reagent and analytical grade.

4-hydroxybenzoic acid | Sigma-Aldrich

There is no sufficient information available as to how ASA influences weight change in plants or what effects it shows on their pigment and protein contents depending on concentrations. It was reported in a study by Shettel and Blake (1983) that SA and p-hydroxybenzoic acid application prevented growth of seedling and reduced dry weight increase in corn (L.), soy bean ( L.), oat (L.) and three wild plants. It was observed in barley plants germinated and grown in different salicylic acid concentrations that secondary leaf area increase and root development were prevented, while protein and chlorophyll (a+b) amount decreased parallel to concentration increase (Pancheva ., 1996). High concentrations of ASA were reported to inhibit root and coleoptile growth (Larque-Saavedra, 1978). In a study carried out with disks taken from primary leaves of one-week bean seedlings, chlorophyll a and b amount decreased parallel to the increase in ASA concentration, while carotenoid amount remained unchanged, but fresh weight loss and protein destruction increased (Çanakci, 2003). The fact that the effects of salicylic acid on plants vary depending on the type of plant, life period during application, concentration applied, manner and duration of application makes it difficult to explain the physiological effects of SA. This situation can be clarified only through a high number of research studies. As it is known, seed germination is a complicated process which aims at the mobilization of reserve substances and thereby includes various resulting hormonal modifications, gene induction and a high number of enzyme syntheses. We think that it is important to know whether SA, a new plant hormone, has any effect on this process which starts with swelling. Therefore, in this study, effects of different concentrations of ASA on germination, various growth parameters and chlorophyll (a+b) amount of cucumber ( L. Beit Alpha) were examined.

Search results for 4-hydroxybenzoic acid at Sigma-Aldrich
Structure, properties, spectra, suppliers and links for: 4-Hydroxybenzoic acid, 99-96-7.

Bench scale synthesis of p-hydroxybenzoic acid using …

The biosynthetic pathway of 3-amino-5-hydroxybenzoic acid (AHBA) formation was studied with cell-free extracts from the rifamycin B producer, S699, and the ansatrienin A producer, Tü1892. Phosphoenolpyruvate (PEP) plus erythrose 4-phosphate (E4P) gave AHBA in low but nevertheless significant (6%) yield. 3,4-Dideoxy-4-amino---heptulosonic acid 7-phosphate (aminoDAHP) was converted efficiently into AHBA (45%), as were 5-deoxy-5-amino-3-dehydroquinic acid (aminoDHQ, 41%) and 5-deoxy-5-amino-3-dehydroshikimic acid (aminoDHS, 95%). On the other hand, the normal shikimate pathway intermediate, 3-deoxy---heptulosonic acid 7-phosphate (DAHP) did not give rise to AHBA under these conditions. AminoDAHP (9%) was produced by incubation of [14C]PEP and E4P, but not of [14C]DAHP, with the cell-free extracts. The results demonstrate the operation of a new variant of the shikimate pathway in the formation of the mC7N units of ansamycin, and presumably also mitomycin, antibiotics which leads from PEP, E4P, and a nitrogen source directly to aminoDAHP and then via aminoDHQ and aminoDHS to AHBA.

4-Hydroxybenzoic acid for synthesis | VWR

3-Hydroxybenzoic acid CAS 99-06-9 | 804537

MeSA is a constituent of the floral scent of flowers (Dudareva et al, 1998), and is synthesized by an -adenosylmethionine-dependent salicyclic acid carboxyl methyltransferase that adds a methyl group to the carboxyl group of salicylic acid, not the -OH group.

4-Hydroxybenzoic Acid For Synthesis - Thomas Sci

The literature about the effects of SA and ASA on germination in plants is limited. It was reported in a study conducted on varieties of tomatoes ( L.) using different concentrations of various (benzoic acid, chlorogenic acid, ferulic acid, p-hydroxybenzoic acid, salicylic acid and 2,4-diacetyl phloroglucinol) that strong phytotoxic effects were observed in 10 μM concentration of chlorogenic acid, in particular. It was stated in the same study that high concentrations of (100 and 1000 μM) prevented germination, reduced root and shoot fresh weight, while lower concentrations did not produce a significant difference in comparison to controls, but brought about different effects when compared to one another. Only 1 μM concentration of 2,4-diacetyl phloroglucinol (phl) increased fresh weight significantly, relative to the control (Jung ., 2001). In a study exploring the effects of short- and long-term SA exposure on germination of cabbage (L.), tomat L.) and cucumber (L.) seeds, it was seen that long-term applications were more effective than short-term applications in preventing germination (K’Opondo ., 2001). It was reported that high concentrations of ferulic acid had a higher inhibitive effect, than lower concentrations, on germination of soy bean ( L. Merill) seeds and led to formation of dwarf roots with necrotic appearance (Colpas ., 2003). It was established that high concentrations of various , prevented seed germination of . Inhibition of germination by exogenous applications of all highly active phenols (10-2 M) except salicylic acid was alleviated by the application of gibberellic acid and kinetin (Khan and Ungar, 1986). Coumarin application was seen to prevent germination in , particularly in high concentrations and encouraged root formation in lower concentrations (Yamamoto and Fujii, 1997). It was established that high concentrations of various (ferulic, gallic, p-hydroxybenzoic acid and p-vanillin) prevented seed germination of six different types of wild herbs. Lower concentrations of these compounds, on the other hand, were seen either to remain ineffective or to show a stimulator effect (Regiosa ., 2004).